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Date: Fri, 11 Dec 2015 10:13:07 +0100
From: Giuseppe CAVALLARO <peppe.cavallaro@...com>
To: Phil Reid <preid@...ctromag.com.au>, <robh+dt@...nel.org>,
<pawel.moll@....com>, <mark.rutland@....com>,
<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
<davem@...emloft.net>, <vbridger@...nsource.altera.com>,
<devicetree@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v5 1/4] stmmac: create of compatible mdio bus for stmacc
driver
Hello Phil
On 12/11/2015 2:44 AM, Phil Reid wrote:
> G'day Giuseppe,
>
> On 11/12/2015 1:16 AM, Giuseppe CAVALLARO wrote:
>> Hi
>>
>> also pls fix this typo
>>
>> stmmac: create of compatible mdio bus for stmacc driver
>> ^^^^^^^^
>> stmmac
> Will do.
>>
>> On 12/9/2015 9:39 AM, Phil Reid wrote:
>>> The DSA driver needs to be passed a reference to an mdio bus. Typically
>>> the mac is configured to use a fixed link but the mdio bus still needs
>>> to be registered so that it con configure the switch.
>>> This patch follows the same process as the altera tse ethernet driver
>>> for
>>> creation of the mdio bus.
>>>
>>> Acked-by: Rob Herring <robh@...nel.org>
>>> Signed-off-by: Phil Reid <preid@...ctromag.com.au>
>>> ---
>>> Documentation/devicetree/bindings/net/stmmac.txt | 8 ++++++
>>> drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 31
>>> +++++++++++++++-------
>>> .../net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
>>> 3 files changed, 31 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt
>>> b/Documentation/devicetree/bindings/net/stmmac.txt
>>> index f34fc3c..fd5ddf8 100644
>>> --- a/Documentation/devicetree/bindings/net/stmmac.txt
>>> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
>>> @@ -47,6 +47,7 @@ Optional properties:
>>> - snps,burst_len: The AXI burst lenth value of the AXI BUS MODE
>>> register.
>>> - tx-fifo-depth: See ethernet.txt file in the same directory
>>> - rx-fifo-depth: See ethernet.txt file in the same directory
>>> +- mdio: with compatible = "snps,dwmac-mdio", create and register
>>> mdio bus.
>>>
>>> Examples:
>>>
>>> @@ -65,4 +66,11 @@ Examples:
>>> tx-fifo-depth = <16384>;
>>> clocks = <&clock>;
>>> clock-names = "stmmaceth";
>>> + mdio0 {
>>> + #address-cells = <1>;
>>> + #size-cells = <0>;
>>> + compatible = "snps,dwmac-mdio";
>>> + phy1: ethernet-phy@0 {
>>> + };
>>> + };
>>> };
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> index bba670c..bb6f75c 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>>> @@ -29,7 +29,7 @@
>>> #include <linux/slab.h>
>>> #include <linux/of.h>
>>> #include <linux/of_gpio.h>
>>> -
>>> +#include <linux/of_mdio.h>
>>> #include <asm/io.h>
>>>
>>> #include "stmmac.h"
>>> @@ -200,10 +200,29 @@ int stmmac_mdio_register(struct net_device *ndev)
>>> struct stmmac_priv *priv = netdev_priv(ndev);
>>> struct stmmac_mdio_bus_data *mdio_bus_data =
>>> priv->plat->mdio_bus_data;
>>> int addr, found;
>>> + struct device_node *mdio_node = NULL;
>>> + struct device_node *child_node = NULL;
>>>
>>> if (!mdio_bus_data)
>>> return 0;
>>>
>>> + if (IS_ENABLED(CONFIG_OF)) {
>>> + for_each_child_of_node(priv->device->of_node, child_node) {
>>> + if (of_device_is_compatible(child_node,
>>> + "snps,dwmac-mdio")) {
>>> + mdio_node = child_node;
>>> + break;
>>> + }
>>> + }
>>> +
>>> + if (mdio_node) {
>>> + netdev_dbg(ndev, "FOUND MDIO subnode\n");
>>> + } else {
>>> + netdev_err(ndev, "NO MDIO subnode\n");
>>> + return 0;
>>> + }
>>> + }
>>> +
>>> new_bus = mdiobus_alloc();
>>> if (new_bus == NULL)
>>> return -ENOMEM;
>>> @@ -231,7 +250,8 @@ int stmmac_mdio_register(struct net_device *ndev)
>>> new_bus->irq = irqlist;
>>> new_bus->phy_mask = mdio_bus_data->phy_mask;
>>> new_bus->parent = priv->device;
>>> - err = mdiobus_register(new_bus);
>>> +
>>> + err = of_mdiobus_register(new_bus, mdio_node);
>>> if (err != 0) {
>>> pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
>>> goto bus_register_fail;
>>> @@ -284,13 +304,6 @@ int stmmac_mdio_register(struct net_device *ndev)
>>> }
>>> }
>>>
>>> - if (!found) {
>>> - pr_warn("%s: No PHY found\n", ndev->name);
>>> - mdiobus_unregister(new_bus);
>>> - mdiobus_free(new_bus);
>>> - return -ENODEV;
>>> - }
>>
>> hmm, this could be necessary on some platforms that wants to
>> get the phy addr at runtime and in case of failure then
>> removes the registered bus.
>>
> Could make this conditional on (!found && !mdio_node).
> Therefore if dt node exists it will be created regardless, otherwise
> unregister if nothing found.
> Thoughts?
>
>>> -
>>> priv->mii = new_bus;
>>>
>>> return 0;
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> index d02691b..6863420 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>> @@ -146,7 +146,7 @@ stmmac_probe_config_dt(struct platform_device
>>> *pdev, const char **mac)
>>> if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr)
>>> == 0)
>>> dev_warn(&pdev->dev, "snps,phy-addr property is
>>> deprecated\n");
>>> ec
>>> - if (plat->phy_node || plat->phy_bus_name)
>>
> I think that would be dependent on the device tree.
> However this may also work:
> if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
that's ok for me
>
>> can this breaks some conf case?
>>
>>> + if (plat->phy_bus_name)
>>> plat->mdio_bus_data = NULL;
>>> else
>>> plat->mdio_bus_data =
>>>
>
> Alternatively the solution would be to introduce some non standard
> device tree node
> to force the creation of the mdio bus.
no, I guess the easier way is what you proposed.
Peppe
>
>
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